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Walling Off Mexico Re your Mexico-U.S. border fence story: There's another aspect worth examining [June 30]. The illegals come to the U.S. seeking employment. Levying a hefty fine on employers who hire them--and no excuses for doing so--would do a lot toward deterring illegals' entry. No jobs, not so many illegals. And some of those who are here would want to go home. W.B. McLain, YAKIMA, WASH.

Walls do not stop invasions: the ancient Chinese found this out the hard way; the French learned it in World War II; the Israelis are learning it now. The wall we are building to...